Here's a cool experiment using standing waves to suspend water droplets. p.s. no affiliation to H.P.
http://www.huffingtonpost.com/2012/09/13/acoustic-levitation-video_n_1881275.html?icid=maing-grid7%7Cmaing6%7Cdl16%7Csec1_lnk3&pLid=206108&utm_ hp_ref=fb&src=sp&comm_ref=falsehttp://www.huffingtonpost.com/2012/0...comm_ref=falsehttp://www.huffingtonpost.com/2012/0...comm_ref=false